This online service enables you to carry out the quality assessment of the daily Global Horizontal Irradiation data of three satellite-based resources versus the measurements of 31 stations of the WRDC network. The satellite-based resources are HelioClim-3 version 4, HelioClim-3 version 5 and MACC-RAD. Select the temporal of you choice in the temporal coverage available for each station, and then retrieve a full report in html format of quality assessment.

The Irradiation Validation Report service has been upgraded during the release of Oct. 2017; it allows you to compare HelioClim-3 and CAMS Radiation data with ground measurements at 31 locations for hourly and daily time steps.

Diffused component measured with a pyranometer and a shadow band: If you need to handle the measurements of the Diffuse Horizontal component acquired by a pyranometer and a shadow-band, the values will likely be underestimated. This is due to the fact that the band is occulting a part of the sky and thus a part of diffuse that should be collected by the sensor. Here at MINES ParisTech/Transvalor, we decided to apply the correction of Muneer-Zhang (Muneer T, Zhang X. A new method for correcting shadow band diffuse irradiance data. J Sol Energy Eng 2002;124:34e43) which sligthly increase the values for the diffuse component.

Measurements with a pyrheliometer: the pyheliometers have a larger half opening angle than the satellite-based estimations (HelioClim-3, MACC-RAD...) which obeys by construction to the definition given by the community of the radiative transfer models where the sun is more punctual. This has a very limited influence in clear sky conditions, but in overcast conditions, the contribution of the circumsolar irradiance to the pyrheliometer measurements may exceed 50% due to specific effects of clouds, especially that of cirrus clouds. No correction is presently brought to the HelioClim-3 or MACC-RAD outputs.